This is the second child for the spouses, who tied the knot in June 2013. They are also parents to son Camden, 20 months.

"I'm lucky," the former Laguna Beach star exclusively told E! News last year. "Both pregnancies have been really easy for me, I've just been really tired. It's just one of those things where I could literally sleep all day everyday but I'm snapping out of it a little bit now that I'm in the second trimester."

At the time, Cavallari didn't know the sex of her baby and said she'd pleased either way. "I honestly don't care, I mean there's great things about both. Another boy would be fun, Cam would have a little buddy and then I'd be the woman of the house...but of course I want a little girl, so I don't know."

In February, the former Hills star announced via Instagram that Baby No. 2 would be a boy.

Last month, Cavallari gave E! News a peek inside her closet. As her due date approached, finding something to wear became increasingly difficult. "All my pregnancy shirts are a mess! I just throw everything in there," she said. "Right now it's kind of hard to find a top that fits because I'm getting so big."

What is she looking forward to wearing post-baby? "Jumpers and rompers!" she said. "I pretty much can't wait to wear anything with a waist line!"